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Wu CC, Qu JJ, Zhang HT, Gao MJ, Zhu L, Zhan XB. New two-stage pH combined with dissolved oxygen control strategy for cyclic β-1,2 glucans synthesis. Appl Microbiol Biotechnol 2023; 107:2235-2247. [PMID: 36894714 DOI: 10.1007/s00253-023-12463-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 02/17/2023] [Accepted: 02/27/2023] [Indexed: 03/11/2023]
Abstract
On the basis of a novel two-stage pH combined with dissolved oxygen (DO) control strategy in fed-batch fermentation, this research addresses the influence of pH on cyclic β-1,2-glucans (CβGs) biosynthesis and melanin accumulation during the production of CβGs by Rhizobium radiobacter ATCC 13,333. Under these optimal fermentation conditions, the maximum cell concentration and CβGs concentration in a 7-L stirred-tank fermenter were 7.94 g L-1 and 3.12 g L-1, which were the maximum production reported for R. radiobacter. The melanin concentration of the fermentation broth was maintained at a low level, which was beneficial to the subsequent separation and purification of the CβGs. In addition, a neutral extracellular oligosaccharide (COGs-1) purified by the two-stage pH combined with DO control strategy fermentation medium was structurally characterized. Structural analyses indicated that COGs-1 was a family of unbranched cyclic oligosaccharides composed of only β-1,2-linked D-glucopyranose residues with degree of polymerization between 17 and 23, namely CβGs. This research provides a reliable source of CβGs and structural basis for further studies of biological activity and function. KEY POINTS: • A two-stage pH combined with DO control strategy was proposed for CβGs production and melanin biosynthesis by Rhizobium radiobacter. • The final extracellular CβGs production reached 3.12 g L-1, which was the highest achieved by Rhizobium radiobacter. • The existence of CβGs could be detected by TLC quickly and accurately.
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Affiliation(s)
- Chuan-Chao Wu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Juan-Juan Qu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Hong-Tao Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Min-Jie Gao
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
| | - Li Zhu
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China
- L & F Biotech. Ltd., Burnaby, BC, V5A3P6, Canada
| | - Xiao-Bei Zhan
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, Wuxi, 214122, Jiangsu, China.
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Li B, Yan ZY, Liu XN, Zhou J, Wu XY, Wei P, Jia HH, Yong XY. Increased fermentative adenosine production by gene-targeted Bacillus subtilis mutation. J Biotechnol 2019; 298:1-4. [PMID: 30974118 DOI: 10.1016/j.jbiotec.2019.04.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2018] [Revised: 03/14/2019] [Accepted: 04/06/2019] [Indexed: 11/17/2022]
Abstract
Adenosine, which is produced mainly by microbial fermentation, plays an important role in the therapy of cardiovascular disease and has been widely used as an antiarrhythmic agent. In this study, guanosine 5'-monophosphate (GMP) synthetase gene (guaA) was inactivated by gene-target manipulation to increase the metabolic flux from inosine 5'-monophosphate (IMP) to adenosine in B. subtilis A509. The resulted mutant M3-3 showed an increased adenosine production from 7.40 to 10.45 g/L, which was further enhanced to a maximum of 14.39 g/L by central composite design. As the synthesis of succinyladenosine monophosphate (sAMP) from IMP catalysed by adenylosuccinate synthetase (encoded by purA gene) is the rate-limiting step in adenosine synthesis, the up-regulated transcription level of purA was the potential underlying mechanism for the increased adenosine production. This work demonstrated a practical strategy for breeding B. subtilis strains for industrial nucleoside production.
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Affiliation(s)
- Biao Li
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China
| | - Zhi-Ying Yan
- Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Science, Chengdu, 610041, China
| | - Xiao-Na Liu
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China
| | - Jun Zhou
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 211816, China; Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, Nanjing, 211816, China
| | - Xia-Yuan Wu
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 211816, China; Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, Nanjing, 211816, China
| | - Ping Wei
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 211816, China; Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, Nanjing, 211816, China
| | - Hong-Hua Jia
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 211816, China; Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, Nanjing, 211816, China
| | - Xiao-Yu Yong
- College of Biotechnology and Pharmaceutical Engineering, Bioenergy Research Institute, Nanjing Tech University, Nanjing, 211816, China; Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing, 211816, China; Jiangsu Synergetic Innovation Center for Advanced Bio-Manufacture, Nanjing, 211816, China.
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Hu J, Wang Z, Lu Z, Chen C, Shi M, Wang J, Zhao E, Zeng K, Yang G. Bio-based adenine-containing high performance polyimide. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.05.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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